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#include <stdio.h>
#include <string.h>
#include "ztxt.h"
#include "my_list.h"
#include "Bkmks.h"
ztxt::ztxt() : bInit(false), expandedtextbuffer(NULL), compressedtextbuffer(NULL) { /*printf("constructing:%x\n",fin);*/ }
int ztxt::OpenFile(const char *src)
{
if (!Cpdb::openpdbfile(src))
{
return -1;
}
//printf("Okay %u\n", 4);
if (head.type != ZTXT_ID) return -1;
gotorecordnumber(0);
fread(&hdr0, 1, sizeof(hdr0), fin);
//printf("Okay %u\n", 5);
buffersize = ntohl(hdr0.size);
compressedtextbuffer = new UInt8[buffersize];
expandedtextbuffer = new UInt8[buffersize];
//printf("Okay %u\n", 6);
home();
//printf("Okay %u\n", 7);
// printf("Returning 0\n");
return 0;
}
int ztxt::getch()
{
if (bufferpos >= buffercontent)
{
size_t reclen = recordlength(++bufferrec);
if (reclen == 0) return -1;
gotorecordnumber(bufferrec);
fread(compressedtextbuffer, reclen, sizeof(char), fin);
zstream.next_in = compressedtextbuffer;
zstream.next_out = expandedtextbuffer;
zstream.avail_out = buffersize;
zstream.avail_in = reclen;
int ret = inflate(&zstream, Z_SYNC_FLUSH);
buffercontent = buffersize - zstream.avail_out;
bufferpos = 0;
}
currentpos++;
return expandedtextbuffer[bufferpos++];
}
unsigned int ztxt::locate()
{
return currentpos;
}
void ztxt::locate(unsigned int n)
{
if (hasrandomaccess())
{
unsuspend();
bufferrec = n / ntohs(hdr0.recordSize) + 1;
if (bufferrec == 1)
{
inflateEnd(&zstream);
}
size_t reclen = recordlength(bufferrec);
if (reclen == 0) return;
gotorecordnumber(bufferrec);
fread(compressedtextbuffer, reclen, sizeof(char), fin);
zstream.next_in = compressedtextbuffer;
zstream.next_out = expandedtextbuffer;
zstream.avail_out = buffersize;
zstream.avail_in = reclen;
if (bufferrec == 1)
{
zstream.zalloc = Z_NULL;
zstream.zfree = Z_NULL;
zstream.opaque = Z_NULL;
inflateInit(&zstream);
}
int ret = inflate(&zstream, Z_SYNC_FLUSH);
buffercontent = buffersize - zstream.avail_out;
bufferpos = 0;
currentpos = n - n % ntohs(hdr0.recordSize);
while (currentpos < n) getch();
}
else
{
home();
while (currentpos < n && getch() != EOF);
}
}
void ztxt::home()
{
unsuspend();
if (bInit)
{
inflateEnd(&zstream);
}
bInit = true;
size_t reclen = recordlength(1);
gotorecordnumber(1);
fread(compressedtextbuffer, reclen, sizeof(char), fin);
zstream.next_in = compressedtextbuffer;
zstream.next_out = expandedtextbuffer;
zstream.avail_out = buffersize;
zstream.avail_in = reclen;
zstream.zalloc = Z_NULL;
zstream.zfree = Z_NULL;
zstream.opaque = Z_NULL;
// printf("Initialising\n");
inflateInit(&zstream);
int ret = inflate(&zstream, Z_SYNC_FLUSH);
// printf("Inflate : %d\n", ret);
bufferpos = 0;
bufferrec = 1;
currentpos = 0;
buffercontent = buffersize - zstream.avail_out;
// printf("buffercontent:%u\n", buffercontent);
}
CList<Bkmk>* ztxt::getbkmklist()
{
UInt16 recno = ntohs(hdr0.bookmarkRecord);
// printf("Bookmarks - record %d contains %d\n", recno, ntohs(hdr0.numBookmarks));
if (recno == 0) return NULL;
CList<Bkmk>* t = new CList<Bkmk>;
unsuspend();
size_t cur = ftell(fin);
gotorecordnumber(recno);
for (int i = 0; i < ntohs(hdr0.numBookmarks); i++)
{
zTXTbkmk bkmk;
if (fread(&bkmk, sizeof(bkmk), 1, fin) != 1) break;
// printf("Bookmark number:%d:%.20s\n", i, bkmk.title);
tchar title[MAX_BMRK_LENGTH];
for (int j = 0; j < MAX_BMRK_LENGTH; j++)
{
title[j] = bkmk.title[j];
}
t->push_back(Bkmk(title, NULL, ntohl(bkmk.offset)));
}
fseek(fin, cur, SEEK_SET);
return t;
}
#ifndef __STATIC
extern "C"
{
CExpander* newcodec() { return new ztxt; }
}
#endif
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